Quakes Rattle Southern Colorado, Northern New Mexico : The Two-WayThe U.S. Geological Survey counts 12 earthquakes of 2.1-magnitude or greater in the same area since Monday afternoon. One was the strongest there since 1973. It measured 5.3 in magnitude. Little damage has been reported.

"The largest earthquake to strike Colorado in almost 40 years" shook buildings but apparently caused little damage late last night, Denver's ABC 7 News reports. A few homes may have been damaged and some rock slides were reported.

It was a 5.3 magnitude temblor and the epicenter was "about 180 miles south of Denver."